Simulation of large-scale electric-ship AC grids using the simulation tool VIAvento

Abstract

In converter-dominated grid structures with low short-circuit power available, the converter controls and nonlinearities of the converters have a strong influence on the overall system stability. E.g. sub-harmonic stability is a key issue in many fields of application like electric ship applications, railways and offshore wind. In order to achieve a reliable systems stability assessment, a comprehensive scenario-based assessment in time domain is unavoidable. Within this paper, the simulation tool VIAvento is briefly presented which allows for these comprehensive time-domain simulations taking the special characteristics of power-electronic assets into account. The capability of VIAvento is demonstrated with simulation results of a large-scale AC ship grid including more than 40 three-phase two-level converters. This capability makes time-domain grid planning and stability assessment in challenging converter topologies possible.